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On the Cisco Nexus 9300 platform switches, if both power supplies connect to the same automatic transfer switch (ATS), and if the power feed to the ATS feed switches from one to another, redundancy might not work.
The issue is only seen with the following model numbers: NXA-PAC-1100W-PI2 NXA-PAC-1100W-PE2 Nexus 9300 platforms with both power supplies connected to same Automatic transfer switch(ATS) and power feed to the ATS feed switches from one to another.
Connect the power supplies to different automatic transfer switches for better resiliency. Note: This issue could still be hit if both ATS were to experience a power transition simultaneously.
Complete fix requires EPLD/FPGA upgrade. Please refer to the "Cisco Nexus 9000 Series FPGA/EPLD Upgrade Release Notes" corresponding to the applicable fixed version of software.
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